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Welsh physician and mathematician, who invented the "equals" sign (=) and also introduced the pre-existing "plus" sign (+) to English speakers in 1557.
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Robert Recorde
Works
- The Grounde of Artes, teachings the Worke and Practise, of Arithmeticke, both in whole numbers and fractions (1543)
- The Urinal of Physick (1548) Google book
- The Pathewaie to Knowledge, containing the First Principles of Geometry … bothe for the use of Instrumentes Geometricall and Astronomicall, and also for Projection of Plattes (1551)
- Castle of Knowledge (1556) Google book
- The Whetstone of Witte (1557) external link
Works about Recorde
- "Recorde, Robert," in Dictionary of National Biography, 1885-1900, London: Smith, Elder, & Co. (1885–1900) in 63 vols.
- "Recorde, Robert," in Encyclopædia Britannica (11th ed., 1911)
Works by this author published before January 1, 1927 are in the public domain worldwide because the author died at least 100 years ago. Translations or editions published later may be copyrighted. Posthumous works may be copyrighted based on how long they have been published in certain countries and areas.
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